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188 
TYRE MAINTENANCE AND REPAIR WORK.
Page 124
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Particulars of Devices for Handling and Repairing the Tyres of Commercial Vehicles.
IDNEUMATIC tyres are now used to I. a large and rapidly growing extent on commercial vehicles generally, so special tools for their manipulation, having regard to their large size, may, of course, be regarded as an abso lute necessity. To meet these re quirements in the case of large-size tyres Harvey Frost and Co., Ltd„ has introduced a tool known as the H.F. tyre changer, which, whilst extremely effective, performing its work without risk of damage to the tyre, comprises only three moving parts, these being operated by . screw gearing. The company likewise markets the Weaver range of tyre-manipulating appliances, amongst which is a spreader which will open out high-pressure and low-pressure tyres for inspection purposes.
Another firm specializineb on tyrehandling tools is the Universal Rim and Tyre Tool Co., Ltd., of Colindale Avenue, London, N.V7.9. One of this concern's latest products is a tool for facilitating the removing of flat-based, demountable-flange solid rims from the tyres of commercial motor vehicles..
In many cases, when outer covers need repair, these are found to be held so securely to the rim by rust or for other reasons that it is difficult to separate them. The new tool consists of a series of levers and hooks, by means of which the rim can be separated and removed from the cover with a minimum of effort, the tool being gradually worked round the rim until the whole of it is brought clear of the tyre.
The outfit includes a special tool which enables the flange when the tyre is repaired fe be easily locked into position. Another tool is specially designed to perform a similar function on the split form of tyre rim, so largely used on American vehicles. This 'comprises a three-armed part and an operating handle, by means of which the rim can
D62 be contracted and expanded as desired. Other useful Pacific tools, supplied by
this 'concern, include a tyre spreader for use in the inspection of the inner sorface of large-size covers, and efficient valve inserter.
The subject of tyre repairing is too large a one to be adequately dealt with in the present article. It must, therefore suffice to say that the majority of the manufacturers of big pneumatic tyres have installed plant for the repair of their respective products. Where a fleet owner has a sufficient number of tyres to be dealt with to warrant the outlay, Harvey Frost and Co., Ltd., is in a position to supply plant to deal with all classes of tyre-repair work, even as regards the biggest sizes.